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Excitability changes induced in the human auditory cortex by transcranial alternating current stimulation.

Yao Wang1, Yue Zhang2, Peiyun Hou2

  • 1Department of Biomedical Engineering, School of Life Sciences, Tiangong University, Tianjin 300387, China; School of Precision Instruments and Optoelectronics Engineering Tianjin University, Tianjin University, Tianjin 300072, China.

Neuroscience Letters
|November 13, 2022
PubMed
Summary

Alpha-tACS (alternating current stimulation) inhibited auditory steady-state responses (ASSR) in normal-hearing individuals, revealing insights into tACS effects on auditory cortex excitability.

Keywords:
Auditory cortexAuditory steady-state responseNeuromodulationTranscranial alternating current stimulation

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Brain Stimulation

Background:

  • Transcranial alternating current stimulation (tACS) modulates brain activity by targeting specific EEG frequencies.
  • Understanding tACS effects on auditory evoked activity is crucial for exploring its impact on auditory cortex excitation/inhibition.
  • Investigating tACS influence on gamma (γ) activity in the auditory cortex is a key area of research.

Purpose of the Study:

  • To assess the effects of alpha (α)-tACS and gamma (γ)-tACS on the auditory steady-state response (ASSR).
  • To investigate tACS-induced changes in auditory cortex excitability.
  • To reveal neurophysiological changes following tACS in normal-hearing participants.

Main Methods:

  • Randomized repeated measures design.
  • 11 normal-hearing participants underwent four sessions with α-tACS, γ-tACS, or sham tACS.
  • Auditory steady-state response (ASSR) was measured 30 minutes post-stimulation.

Main Results:

  • Alpha (α)-tACS demonstrated an inhibitory effect on 40-Hz ASSR.
  • This inhibitory effect was observed in comparison to both gamma (γ)-tACS and sham tACS.
  • The findings highlight frequency-specific modulatory effects of tACS on auditory processing.

Conclusions:

  • tACS can modulate auditory cortex excitability in a frequency-dependent manner.
  • α-tACS exhibits an inhibitory influence on auditory steady-state responses.
  • These findings advance the understanding of neurophysiological changes induced by tACS in the human auditory system.